Whooping cranes are the birds found in North America and are the tallest and most endangered species. The U.S. and Canada jointly signed a migratory bird treaty that impacted positively.
What are claiming factors affecting the population?
The population is the number of organisms of the particular species in the given defined area. Claiming factors like abiotic factors affects the population size of the species of the area in a positive or negative manner.
The act between the United States and Canada prohibited the killing, trading, capturing and selling of the protected migratory whooping bird species.
This treaty for the conservation and protection of the whooping bird led to the increase of the population of the bird and had a positive influence on their population.
Therefore, option c. the joint treaty impacted positively on the population of the bird species.
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